﻿using System;
using System.Collections.Generic;
using System.Text;

namespace ChangeDemo
{
    public class Change
    {
        public bool IsHelloWorld(string str) {
            return str.Equals("Hello World!");
        }
        public bool IsSingle(int num)
        {
            if (num % 2 == 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}
